<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      margin:0;
      padding:0;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      background-color: #000;
      perspective: 3200px;
    }
    .btn {
      position: relative;
      overflow: hidden;
      font-size: 32px;
      color:#03e9f4;
      letter-spacing: 2px;
      box-sizing: border-box;
      padding: 20px;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color:transparent;
      font-weight: 600;
      transition: all .4s;
      cursor: pointer;
    }
    .btn:hover {
      color:#000;
      background-color: #03e9f4;
      border: 4px solid rgba(255,255,255,.2);
      box-shadow: 0 0 5px #03e9f4,
                  0 0 25px #03e9f4,
                  0 0 50px #03e9f4,
                  0 0 200px #03e9f4;
      border-radius: 4px;
      /* 倒影 */
      -webkit-box-reflect:below 1px linear-gradient(transparent, #0005);
    }
  </style>
</head>
<body>
  <div class="btn">
    Hello,World!
  </div>
</body>
</html>